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Aerobic Septic Systems

The basic aerobic septic system, aka aerobic treatment unit (ATU), aerobic wastewater treatment plant and aerobic treatment sewage disposal system, is a system that provides a suitable oxygen rich environment for organisms that can reduce the organic portion of the waste into carbon dioxide and water in the presence of oxygen.

Conventional Graveled Systems

The older-style graveled systems contain a layer of gravel in the drainfield. While some treatment of waste occurs in the septic tanks, most of the treatment occurs as wastewater discharged from the tank enters the drainfield and is filtered through the gravel and the soil below.